Numbers n such that string 1,7 occurs in the base 10 representation of n but not of n-1.

Terms

a(0) =17a(1) =117a(2) =170a(3) =217a(4) =317a(5) =417a(6) =517a(7) =617a(8) =717a(9) =817a(10) =917a(11) =1017a(12) =1117a(13) =1170a(14) =1217a(15) =1317a(16) =1417a(17) =1517a(18) =1617a(19) =1700a(20) =1817a(21) =1917a(22) =2017a(23) =2117a(24) =2170a(25) =2217a(26) =2317a(27) =2417a(28) =2517a(29) =2617